engleski

The protection function of the Quaternary deposits of the Vransko polje

The Vransko polje is a typical karst polje with the thick Quaternary pond and lacustrine deposits. A composition of deposits is: sand, silt and clay. It was taken samples of water from springs: Turanjsko lake, Tinjski bunar, Kakma and channel Kotarka and samples of soil through the profiles at the five locations around. In all those samples were measured next geochemical indicators: major anions and cations and heavy metals. For better understanding the distribution of the geochemical indicators through the profiles of the overlying deposits and the relationship between them, it was done R -cluster multivariate statistical analysis. The result of the R-cluster analysis shows that there are few groups of elements with the similar distribution. Also, because of the interest in the behavior and the effectiveness of agricultural chemicals (fertilizers and pesticides) on the quality of the vadose zone (water and soil) and possible contamination of the karst groundwater, it was done the solute transport model of a chosen geochemical indicator: nitrate-nitrogen (NO3-N), ammonia-nitrogen (NH4+) and nickel (Ni). As a model it was used VS2DT model. The model is based on the solution of Richard&#8217 ; s equation. The fitting between simulated curve and measured curve was not as it was expected. That was the consequences of many factors as: were the right infiltration and/or percolation conditions, very high vertical and lateral heterogeneity of the porous media (overlying deposits), soil properties, were all biochemical and chemical processes included etc.

Vransko polje; geochemical indicator; modelling

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